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CRC5_EPCC1G2.pas
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CRC5_EPCC1G2.pas
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unit CRC5_EPCC1G2;
//CRC-5 EPC-C1G2
//Author: domasz
//Last Update: 2022-11-22
//Licence: MIT
interface
uses SysUtils, HasherBase;
type THasherCRC5_EPCC1G2 = class(THasherbase)
private
FHash: Byte;
public
constructor Create; override;
procedure Update(Msg: PByte; Length: Integer); override;
function Final: String; override;
end;
implementation
var Table: array[0..255] of Byte = (
$15, $1C, $07, $0E, $18, $11, $0A, $03,
$0F, $06, $1D, $14, $02, $0B, $10, $19,
$08, $01, $1A, $13, $05, $0C, $17, $1E,
$12, $1B, $00, $09, $1F, $16, $0D, $04,
$06, $0F, $14, $1D, $0B, $02, $19, $10,
$1C, $15, $0E, $07, $11, $18, $03, $0A,
$1B, $12, $09, $00, $16, $1F, $04, $0D,
$01, $08, $13, $1A, $0C, $05, $1E, $17,
$1A, $13, $08, $01, $17, $1E, $05, $0C,
$00, $09, $12, $1B, $0D, $04, $1F, $16,
$07, $0E, $15, $1C, $0A, $03, $18, $11,
$1D, $14, $0F, $06, $10, $19, $02, $0B,
$09, $00, $1B, $12, $04, $0D, $16, $1F,
$13, $1A, $01, $08, $1E, $17, $0C, $05,
$14, $1D, $06, $0F, $19, $10, $0B, $02,
$0E, $07, $1C, $15, $03, $0A, $11, $18,
$0B, $02, $19, $10, $06, $0F, $14, $1D,
$11, $18, $03, $0A, $1C, $15, $0E, $07,
$16, $1F, $04, $0D, $1B, $12, $09, $00,
$0C, $05, $1E, $17, $01, $08, $13, $1A,
$18, $11, $0A, $03, $15, $1C, $07, $0E,
$02, $0B, $10, $19, $0F, $06, $1D, $14,
$05, $0C, $17, $1E, $08, $01, $1A, $13,
$1F, $16, $0D, $04, $12, $1B, $00, $09,
$04, $0D, $16, $1F, $09, $00, $1B, $12,
$1E, $17, $0C, $05, $13, $1A, $01, $08,
$19, $10, $0B, $02, $14, $1D, $06, $0F,
$03, $0A, $11, $18, $0E, $07, $1C, $15,
$17, $1E, $05, $0C, $1A, $13, $08, $01,
$0D, $04, $1F, $16, $00, $09, $12, $1B,
$0A, $03, $18, $11, $07, $0E, $15, $1C,
$10, $19, $02, $0B, $1D, $14, $0F, $06
);
constructor THasherCRC5_EPCC1G2.Create;
var i: Integer;
begin
inherited Create;
FHash := $09;
Check := '00';
end;
procedure THasherCRC5_EPCC1G2.Update(Msg: PByte; Length: Integer);
var i: Integer;
begin
for i:=0 to Length-1 do begin
FHash := Table[(FHash shl 3) xor Msg^ ] ;
Inc(Msg);
end;
end;
function THasherCRC5_EPCC1G2.Final: String;
begin
FHash := (FHash shr 3) ;
Result := IntToHex(FHash, 2);
end;
initialization
HasherList.RegisterHasher('CRC-5 EPC-C1G2', THasherCRC5_EPCC1G2);
end.